What significant discovery is associated with Schwann?

The significant discovery associated with Schwann is that all animals are made of cells. This conclusion is part of the broader cell theory, which asserts that all living organisms are composed of cells. Schwann's contributions to this theory were crucial because he, along with Matthias Schleiden, established that not only plants are made up of cells but also animals, highlighting the unifying concept of cellular structure across all forms of life.

This discovery was foundational in biology, as it shifted the understanding of living organisms and established cells as the basic unit of life. By demonstrating that animals are composed of cells, Schwann helped to unify the biological sciences and laid the groundwork for modern cellular biology. This principle emphasizes that the study of cells is crucial for understanding the anatomy and physiology of both plants and animals.